convert_to_svg should report any errors to the user

[eulertour]

A lot of system-dependent things can go wrong while attempting to perform this conversion, but by suppressing the error we're making it harder for the user to debug it. Any error messages generated should be reported to the user in the following exception.

https://github.com/ManimCommunity/manim/blob/a1180be72d29adcf7d6a02c044e933acbf794d68/manim/utils/tex_file_writing.py#L196-L207

[kilacoda-old]

So we just have to remove lines 204-205?

[leotrs]

No. Instead of using os.system or subprocess.run, I think we want to use subprocess.check_call. Or is there a better alternative?

Note I tried this in #546 and it's a bit more complicated than it looked at first :sweat_smile:

[PhilippImhof]

This reminds me of https://github.com/ManimCommunity/manim/pull/561